
INTRODUCTION
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The purpose of this class is to provide an easy way to perform
conversion of decimal digits to Roman Numeral digits and vice-versa.
Also, it's possible to perform most numeral operations such as
addition, subtraction, multiplication and division. When performing
such operations with an object from a different class, the object's
class must implement __int__.

EXAMPLES
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>>> from romanpy import RomanNumeral as Numeral
>>> Numeral(20)
'XX'
>>> rn = Numeral('XIX')
>>> rn
'XIX'
>>> str(rn)
'XIX'
>>> int(rn)
19
>>> rn < 100
True
>>> rn == 19
True
>>> rn > Numeral('V')
True
>>> rn += 1
>>> rn
'XX'
>>> int(rn)
20

